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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.2.2/] [gcc/] [c-ppoutput.c] - Rev 154
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/* Preprocess only, using cpplib. Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007 Free Software Foundation, Inc. Written by Per Bothner, 1994-95. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; see the file COPYING3. If not see <http://www.gnu.org/licenses/>. */ #include "config.h" #include "system.h" #include "coretypes.h" #include "tm.h" #include "cpplib.h" #include "../libcpp/internal.h" #include "tree.h" #include "c-common.h" /* For flags. */ #include "c-pragma.h" /* For parse_in. */ /* Encapsulates state used to convert a stream of tokens into a text file. */ static struct { FILE *outf; /* Stream to write to. */ const cpp_token *prev; /* Previous token. */ const cpp_token *source; /* Source token for spacing. */ int src_line; /* Line number currently being written. */ unsigned char printed; /* Nonzero if something output at line. */ bool first_time; /* pp_file_change hasn't been called yet. */ } print; /* General output routines. */ static void scan_translation_unit (cpp_reader *); static void scan_translation_unit_trad (cpp_reader *); static void account_for_newlines (const unsigned char *, size_t); static int dump_macro (cpp_reader *, cpp_hashnode *, void *); static void print_line (source_location, const char *); static void maybe_print_line (source_location); /* Callback routines for the parser. Most of these are active only in specific modes. */ static void cb_line_change (cpp_reader *, const cpp_token *, int); static void cb_define (cpp_reader *, source_location, cpp_hashnode *); static void cb_undef (cpp_reader *, source_location, cpp_hashnode *); static void cb_include (cpp_reader *, source_location, const unsigned char *, const char *, int, const cpp_token **); static void cb_ident (cpp_reader *, source_location, const cpp_string *); static void cb_def_pragma (cpp_reader *, source_location); static void cb_read_pch (cpp_reader *pfile, const char *name, int fd, const char *orig_name); /* Preprocess and output. */ void preprocess_file (cpp_reader *pfile) { /* A successful cpp_read_main_file guarantees that we can call cpp_scan_nooutput or cpp_get_token next. */ if (flag_no_output) { /* Scan -included buffers, then the main file. */ while (pfile->buffer->prev) cpp_scan_nooutput (pfile); cpp_scan_nooutput (pfile); } else if (cpp_get_options (pfile)->traditional) scan_translation_unit_trad (pfile); else scan_translation_unit (pfile); /* -dM command line option. Should this be elsewhere? */ if (flag_dump_macros == 'M') cpp_forall_identifiers (pfile, dump_macro, NULL); /* Flush any pending output. */ if (print.printed) putc ('\n', print.outf); } /* Set up the callbacks as appropriate. */ void init_pp_output (FILE *out_stream) { cpp_callbacks *cb = cpp_get_callbacks (parse_in); if (!flag_no_output) { cb->line_change = cb_line_change; /* Don't emit #pragma or #ident directives if we are processing assembly language; the assembler may choke on them. */ if (cpp_get_options (parse_in)->lang != CLK_ASM) { cb->ident = cb_ident; cb->def_pragma = cb_def_pragma; } } if (flag_dump_includes) cb->include = cb_include; if (flag_pch_preprocess) { cb->valid_pch = c_common_valid_pch; cb->read_pch = cb_read_pch; } if (flag_dump_macros == 'N' || flag_dump_macros == 'D') { cb->define = cb_define; cb->undef = cb_undef; } /* Initialize the print structure. Setting print.src_line to -1 here is a trick to guarantee that the first token of the file will cause a linemarker to be output by maybe_print_line. */ print.src_line = -1; print.printed = 0; print.prev = 0; print.outf = out_stream; print.first_time = 1; } /* Writes out the preprocessed file, handling spacing and paste avoidance issues. */ static void scan_translation_unit (cpp_reader *pfile) { bool avoid_paste = false; print.source = NULL; for (;;) { const cpp_token *token = cpp_get_token (pfile); if (token->type == CPP_PADDING) { avoid_paste = true; if (print.source == NULL || (!(print.source->flags & PREV_WHITE) && token->val.source == NULL)) print.source = token->val.source; continue; } if (token->type == CPP_EOF) break; /* Subtle logic to output a space if and only if necessary. */ if (avoid_paste) { if (print.source == NULL) print.source = token; if (print.source->flags & PREV_WHITE || (print.prev && cpp_avoid_paste (pfile, print.prev, token)) || (print.prev == NULL && token->type == CPP_HASH)) putc (' ', print.outf); } else if (token->flags & PREV_WHITE) putc (' ', print.outf); avoid_paste = false; print.source = NULL; print.prev = token; cpp_output_token (token, print.outf); if (token->type == CPP_COMMENT) account_for_newlines (token->val.str.text, token->val.str.len); } } /* Adjust print.src_line for newlines embedded in output. */ static void account_for_newlines (const unsigned char *str, size_t len) { while (len--) if (*str++ == '\n') print.src_line++; } /* Writes out a traditionally preprocessed file. */ static void scan_translation_unit_trad (cpp_reader *pfile) { while (_cpp_read_logical_line_trad (pfile)) { size_t len = pfile->out.cur - pfile->out.base; maybe_print_line (pfile->out.first_line); fwrite (pfile->out.base, 1, len, print.outf); print.printed = 1; if (!CPP_OPTION (pfile, discard_comments)) account_for_newlines (pfile->out.base, len); } } /* If the token read on logical line LINE needs to be output on a different line to the current one, output the required newlines or a line marker, and return 1. Otherwise return 0. */ static void maybe_print_line (source_location src_loc) { const struct line_map *map = linemap_lookup (&line_table, src_loc); int src_line = SOURCE_LINE (map, src_loc); /* End the previous line of text. */ if (print.printed) { putc ('\n', print.outf); print.src_line++; print.printed = 0; } if (src_line >= print.src_line && src_line < print.src_line + 8) { while (src_line > print.src_line) { putc ('\n', print.outf); print.src_line++; } } else print_line (src_loc, ""); } /* Output a line marker for logical line LINE. Special flags are "1" or "2" indicating entering or leaving a file. */ static void print_line (source_location src_loc, const char *special_flags) { /* End any previous line of text. */ if (print.printed) putc ('\n', print.outf); print.printed = 0; if (!flag_no_line_commands) { const struct line_map *map = linemap_lookup (&line_table, src_loc); size_t to_file_len = strlen (map->to_file); unsigned char *to_file_quoted = (unsigned char *) alloca (to_file_len * 4 + 1); unsigned char *p; print.src_line = SOURCE_LINE (map, src_loc); /* cpp_quote_string does not nul-terminate, so we have to do it ourselves. */ p = cpp_quote_string (to_file_quoted, (unsigned char *) map->to_file, to_file_len); *p = '\0'; fprintf (print.outf, "# %u \"%s\"%s", print.src_line == 0 ? 1 : print.src_line, to_file_quoted, special_flags); if (map->sysp == 2) fputs (" 3 4", print.outf); else if (map->sysp == 1) fputs (" 3", print.outf); putc ('\n', print.outf); } } /* Called when a line of output is started. TOKEN is the first token of the line, and at end of file will be CPP_EOF. */ static void cb_line_change (cpp_reader *pfile, const cpp_token *token, int parsing_args) { source_location src_loc = token->src_loc; if (token->type == CPP_EOF || parsing_args) return; maybe_print_line (src_loc); print.prev = 0; print.source = 0; /* Supply enough spaces to put this token in its original column, one space per column greater than 2, since scan_translation_unit will provide a space if PREV_WHITE. Don't bother trying to reconstruct tabs; we can't get it right in general, and nothing ought to care. Some things do care; the fault lies with them. */ if (!CPP_OPTION (pfile, traditional)) { const struct line_map *map = linemap_lookup (&line_table, src_loc); int spaces = SOURCE_COLUMN (map, src_loc) - 2; print.printed = 1; while (-- spaces >= 0) putc (' ', print.outf); } } static void cb_ident (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line, const cpp_string *str) { maybe_print_line (line); fprintf (print.outf, "#ident %s\n", str->text); print.src_line++; } static void cb_define (cpp_reader *pfile, source_location line, cpp_hashnode *node) { maybe_print_line (line); fputs ("#define ", print.outf); /* 'D' is whole definition; 'N' is name only. */ if (flag_dump_macros == 'D') fputs ((const char *) cpp_macro_definition (pfile, node), print.outf); else fputs ((const char *) NODE_NAME (node), print.outf); putc ('\n', print.outf); if (linemap_lookup (&line_table, line)->to_line != 0) print.src_line++; } static void cb_undef (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line, cpp_hashnode *node) { maybe_print_line (line); fprintf (print.outf, "#undef %s\n", NODE_NAME (node)); print.src_line++; } static void cb_include (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line, const unsigned char *dir, const char *header, int angle_brackets, const cpp_token **comments) { maybe_print_line (line); if (angle_brackets) fprintf (print.outf, "#%s <%s>", dir, header); else fprintf (print.outf, "#%s \"%s\"", dir, header); if (comments != NULL) { while (*comments != NULL) { if ((*comments)->flags & PREV_WHITE) putc (' ', print.outf); cpp_output_token (*comments, print.outf); ++comments; } } putc ('\n', print.outf); print.src_line++; } /* Callback called when -fworking-director and -E to emit working directory in cpp output file. */ void pp_dir_change (cpp_reader *pfile ATTRIBUTE_UNUSED, const char *dir) { size_t to_file_len = strlen (dir); unsigned char *to_file_quoted = (unsigned char *) alloca (to_file_len * 4 + 1); unsigned char *p; /* cpp_quote_string does not nul-terminate, so we have to do it ourselves. */ p = cpp_quote_string (to_file_quoted, (unsigned char *) dir, to_file_len); *p = '\0'; fprintf (print.outf, "# 1 \"%s//\"\n", to_file_quoted); } /* The file name, line number or system header flags have changed, as described in MAP. */ void pp_file_change (const struct line_map *map) { const char *flags = ""; if (flag_no_line_commands) return; if (map != NULL) { if (print.first_time) { /* Avoid printing foo.i when the main file is foo.c. */ if (!cpp_get_options (parse_in)->preprocessed) print_line (map->start_location, flags); print.first_time = 0; } else { /* Bring current file to correct line when entering a new file. */ if (map->reason == LC_ENTER) { const struct line_map *from = INCLUDED_FROM (&line_table, map); maybe_print_line (LAST_SOURCE_LINE_LOCATION (from)); } if (map->reason == LC_ENTER) flags = " 1"; else if (map->reason == LC_LEAVE) flags = " 2"; print_line (map->start_location, flags); } } } /* Copy a #pragma directive to the preprocessed output. */ static void cb_def_pragma (cpp_reader *pfile, source_location line) { maybe_print_line (line); fputs ("#pragma ", print.outf); cpp_output_line (pfile, print.outf); print.src_line++; } /* Dump out the hash table. */ static int dump_macro (cpp_reader *pfile, cpp_hashnode *node, void *v ATTRIBUTE_UNUSED) { if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN)) { fputs ("#define ", print.outf); fputs ((const char *) cpp_macro_definition (pfile, node), print.outf); putc ('\n', print.outf); print.src_line++; } return 1; } /* Load in the PCH file NAME, open on FD. It was originally searched for by ORIG_NAME. Also, print out a #include command so that the PCH file can be loaded when the preprocessed output is compiled. */ static void cb_read_pch (cpp_reader *pfile, const char *name, int fd, const char *orig_name ATTRIBUTE_UNUSED) { c_common_read_pch (pfile, name, fd, orig_name); fprintf (print.outf, "#pragma GCC pch_preprocess \"%s\"\n", name); print.src_line++; }